The Mets have lost three straight and finish the month of June, 5-21, the worst record for that month in team history. They dropped a season-worst 16 games below .500.

“It’s hard for me to speak for everybody. I’m definitely frustrated, frustrated with how the night went,” deGrom said. “I’m tired of losing to be honest.”

What made it so much worse is that they did it on the day their best pitcher took the mound.

DeGrom went into the game with the best ERA in the majors but with just five wins because of a lack of run support, bullpen collapses and defensive lapses.

The ace, who missed his regularly scheduled start on Friday because of a “family issue,” seemed to run out of gas in the sixth. DeGrom gave up three earned runs on six hits.

After striking out four in a row, he gave up a two-run home run to Brian Anderson. He issued a two-out walk to Justin Bour and a single to Starlin Castro, moving Bour to third, where he scored on yet another Mets’ defensive lapse.

JT Riddle’s bunt up the first-base line seemed to confuse Wilmer Flores, playing just his 88th career game at first base in the big leagues. Flores failed to charge the slow roller, allowing the Marlins’ shortstop to run past him.

“You just gotta come and get it. You got to sell out. If you wait for that thing to go foul the runners are running around the bases,” Callaway said. “He still had a chance to come get it hard and put the tag on before the runner would have gotten past of him. He got a little indecisive.”

Flores said he thought the only play he had was at home and that he had no chance.

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“It was just an unfortunate play,” Flores said.

Robert Gsellman gave up two unearned runs on a double to J.T. Realmuto in the seventh. The struggling reliever should have been out of the inning when Amed Rosario bobbled Brian Anderson’s ground ball.

The Mets just suffered their worst June in franchise history. (Julie Jacobson / AP)

PLAY OF THE GAME

DeGrom striking out the side in the fifth inning, getting JT Riddle and Lewis Brinson swinging and Yadiel Rivera looking.

TURNING POINT

Riddle’s bunt in the sixth was misplayed by Flores, who instead of charging the ball waited for it to roll to him. Riddle ran past him to first, allowing the Marlins’ go-ahead run to score.

STAR OF THE GAME

Marlins’ rookie right-hander Pablo Lopez held the Mets to two runs on six hits. He walked one and struck out five in his major league debut

STAT OF THE GAME

.400: The Mets have the lowest winning percentage, .400, in the national league.

UNSUNG HERO

Todd Frazier snapped a 31 at-bat home run drought with his solo shot in the sixth inning.

M.I.A.

Brandon Nimmo went 0-for-4 with two strikeouts. Since he was hit on the hand a week before, Nimmo is just 1-for-13.